What should i do? (TMI)

So, I'm probably just going crazy but here's my story. This cycle my af was late three days. And all these three days I was nauseated and dizzy. Especially on day three. I did the test on day three with fmu and it was bfn. On the 4th day I started bleeding, it was less than usual but still bleeding, not spotting. Also the colour was really dark and (cause I'm using menstrual cup) it had a lot of clear discharge as well. It was going for two days. Today is the third day, I went to check on the cup at 2pm and it was empty with a tiny bit of brown discharge.

I usually have a regular cycle and three days delay is a lot for me. I also always have 5 days of af: 1-2 heavy, 3 - medium/light, 4 - spotting, 5 - light. So whatever happens now is really weird. I've been also nauseous an dizzy all this time. Do you think I should go to see my GP? Or just wait and see how my next cycle goes?

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